Antenna



FIG. 1 is a perspective view of an antenna showing our new design;

FIG. 2 is a top plan view thereof with the bottom plan view being a mirror image thereof;

FIG. 3 is a left side elevational view thereof, with the right side elevational view being a mirror image thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a back elevational view thereof. 

The ornamental design for an antenna, as shown and described. 